System and method for producing fully-graphitized carbon product through waste cathode carbon blocks of electrolyzed aluminum

Abstract

The invention discloses a system and method for producing a fully-graphitized carbon product through waste cathode carbon blocks of electrolyzed aluminum. The system and method are high in recovery and utilization rate, high in economic value added, safe and environmental friendly. The system comprises a crushing unit, a weighting and feeding unit, a roasting unit, a cooling unit, a packing unit, a waste gas treating unit and a dust collecting unit. According to the system and method, the waste cathode carbon blocks are utilized to produce the fully-graphitized carbon product; the waste cathode carbon blocks are roasted at high temperature through a high-temperature furnace, thus cyanides in the waste cathode carbon blocks can be decomposed and volatilized, fluorides enters the exhaust gas in a steam form, and as a result, the ash contents in the waste cathode carbon blocks can be effectively reduced, the graphitizing degree can be increased to be more than 99%, and the waste cathode carbon blocks can be directly sold as the fully-graphitized carbon product. The system and method are high in degree of automation, easy to operate, safe and environmental friendly; the treatment efficiency of the waste cathode carbon blocks and the resource recovery and utilization rate can be effectively improved, the operation cost of an enterprise can be decreased, and the economic benefit of the enterprise can be increased.

Description

technical field [0001] The invention relates to the technical field of aluminum electrolysis waste recycling, in particular to a system and method for producing fully graphitized carbon products by using electrolytic aluminum waste cathode carbon blocks. Background technique [0002] The original composition of the cathode carbon block is anthracite and pitch binder. During the electrolysis process, due to the molten salt reaction and chemical reaction caused by thermal action, chemical action, mechanical erosion action, electrical action, sodium and electrolyte penetration, etc., The cathode carbon block in the aluminum electrolytic cell will be damaged after a certain period of use. According to statistics, for every ton of aluminum produced and cast, about 20-30kg of waste cathodes are produced. In 2013, my country's primary aluminum output reached 23 million tons, accounting for about 45% of the global total output, and the waste carbon cathode emissions reached 400,000 ...

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Problems solved by technology

[0004] For a long time, many countries in the world have done a lot of research on the treatment methods of spent cathode carbon blocks, including roasting method, flotation method and sulfuric acid decomposition method, etc., but the main standpoint is only on the harmless treatment of such substances , the processing cost is relatively high, and the economic added value of the product is relatively low

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